Riello PRESS 100 N Installation, Use And Maintenance Instructions page 19

NOTE
The pre-heater might be provided with a second thermostat of maximum value with a manual reset. 
That thermostat can be used as a switch operating by means of an external commutator, which can take off
the current from the pre-heater in case of over-temperature (Kit code no. 3000800).
Before the burner start-up, verify that the pump is filled of fuel in order to avoid any idling for too long time.
Filters cleaning: 
periodically clean the filters in order to avoid any trouble at the burner operation.
Supply line filter: 
positioned on the suction line, it causes the increase of the depression in the pump with the consequent flow
of gas and noise. Do not overcome the depression of 45 cm Hg (6 m W.c.) (5, fig. 1).
Pre-heater filter (10, fig. 1): 
positioned in the delivery line, it causes a decrease of the spraying pressure which is detectable by use of a
manometer (12, fig. 1).
MANOMETER PROTECTION VALVE
After spray pressure check, it is recommended to cut out the manometer (12, fig. 1) to avoid pressure shock that
it can suffer at every burner starting. Close protection valve when the burner is not working and the manometer
indicate 0 bar.

4.6 BURNER START-UP CYCLE
Normal
Thermostat
Motor
Ignition transformer
st
1 flame valve
nd
2 flame valve
Lock-out lamp
Motor lock-out
It is caused by the motor overload relay if over-load occurs or no phase.
Reset: push the buttons 7 and 8, fig. 1.

4.7 BURNER START-UP CYCLE DIAGNOSTICS
During start-up, indication is according to the followin table:
Sequences
Pre-purging
Ignition phase
Operation, flame ok
Operating with weak flame signal
Electrical supply lower than ~ 170V
Lock-out
Extraneous light
Key: Off
2915830
Lock-out because no ignition
COLOUR CODE TABLE
Yellow Green
8
GB
D2713
Colour code
Red